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Systemic delayed-type hypersensitivity to cholera toxin and a detoxified derivative
1Gastrointestinal Unit, University of Edinburgh, Western General Hospital.
Clinical and Experimental Immunology
|April 1, 1989
Summary
This study shows that cholera toxin (CT) can induce a T cell-mediated delayed-type hypersensitivity (DTH) response in mice. This finding suggests a potential role for T cells in preventing choleraic diarrhea.
Area of Science:
- Immunology
- Microbiology
Background:
- Cholera toxin (CT) is a potent enterotoxin produced by Vibrio cholerae.
- Understanding the immune response to CT is crucial for developing effective countermeasures against cholera.
Purpose of the Study:
- To investigate the delayed-type hypersensitivity (DTH) response to cholera toxin (CT) in a murine model.
- To characterize the effector mechanisms involved in the DTH response to CT.
Main Methods:
- Adult BALB/c mice were immunized with CT or a purified toxoid (TD) in complete Freund's adjuvant (CFA).
- DTH responses were assessed by measuring footpad swelling.
- Histological examination and adoptive transfer experiments were performed to analyze the cellular infiltrate and specificity of the response.
Main Results:
- TD was a suitable antigen for measuring DTH to CT, unlike CT itself which caused interfering edema.
- DTH responses were dose-dependent, with optimal induction at 1 microgram of CT.
- The DTH response was biphasic, involving initial edema followed by mononuclear cell infiltration.
- Adoptive transfer confirmed antigen-specific DTH mediated by T cells.
Conclusions:
- This study demonstrates, for the first time, an effector T cell response to cholera toxin.
- T cell-mediated immunity may play a role in the intestinal mucosa's defense against cholera toxin and prevention of choleraic diarrhea.